Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c2a582528d4897…

MALICIOUS

PDF

86.6 KB Created: 2021-08-12 19:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8c5691a56651120e3622bada205f999c SHA-1: dbe38fb038682cd137e7503ba3abb770ccffe0c2 SHA-256: c5c2a582528d4897bbfc6b5916811eb2035ffb520c782cbf334984602d67effc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The PDF's structure and the presence of these links suggest it is used as a lure, likely for phishing or to distribute further malware. No scripts were extracted, but the heuristic firings strongly indicate malicious intent via external URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e6b5696be---96842256510.pdf In PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4962efe08de4048495271a94eb5abc97/ripusizujikofigas.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/jabafugizem.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/wudabitopirasowafa.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ec53cd105c7096c9d3852fed80cfce5f/wifolofavufowavapekasoxuv.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/56e1f4b22115e8c23f46e996a01d06ab/kenek.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81e1a3b331---jojetozolubuzoreliviku.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///33682012279.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/auhabqqkc6oijp81jm6emm3ncs/tewuxuwenipo.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160f970ecc7e98---1457220253.pdfIn PDF document text
    • http://cmtsport.com/pliki/30668665218.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076312106d5a---wovonalajusid.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/95292441036.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/mirinutabanuwar.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb39377b60e---83783461750.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac8725fc6---kabitogubi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ceaf740f39b---52885730091.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/33207392906.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/fdb322b64830f2e94bcc13b7cd2c4c2b/buzubudamirinufokirotewig.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3ca31ce710db96d7ce9338b2d275215f/dufewakapigugiz.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/zetokixowobujipet.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/0aa4ca38e99f5d442f05853380a9dab4/zurexukuduvoje.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3acdf88ace---lidupojexugimixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+tell+if+refrigerator+compressor+is+workingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 16900 bytes
SHA-256: 987a5b038e6f11f11b13d89b5b2da0651ce217269a4d92e93ff647544ce83ff4
font_02_sfnt_off00013312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13312 10992 bytes
SHA-256: c2641374bd255ff0ef96eb729dda77cb356f1241c463c0bfe7242afc96ca10f9

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